Precambrian

Late Precambrian mafic dyke swarms are extensively developed in the central North China Craton.

华北克拉通中部广泛发育晚前寒武纪镁铁质岩墙群.

Precambrian time for as much as eighty-five percent of all geological time.

从前寒 武 世纪以来地球地面大部分被冰川所覆盖的任何地质年代.

They are in fact metamorphosed rocks , predominantly schist , amphibolites, granites and sand stones and Muruwa Precambrian.

事实上,它们主要由地片岩、闪岩 、 花岗岩和细沙,小石头变质而来.

Two main glacial epochs affected both areas during the last 100 million years of Precambrian times.

在前寒武纪的最后1亿年中，两个主要的冰川时期对两个地区都产生了影响。

Of , belonging to, or designating the earlier of two divisions of the Precambrian era.

(地质学)在前寒武纪后半部分形成的.

Precambrian time accounts for as much as eighty-five percent of all geological time.

前寒武纪占据了整个地质年代的百分之85.

Gneiss, a metamorphic rock, can be commonly found in Precambrian areas.

片麻岩, 变质岩, 可以发现,在常见的前寒武纪地区.

Rapakivi is a special rock in Precambrian.

环斑花岗岩是发育于前寒武纪的一种特殊岩石.

They are controlled by shear fracture belt of epimetamorphic rock series of Precambrian Period.

主要赋存于前寒武纪浅变质岩系中,受剪切断裂带控制.

The oldest rocks in the concession area belong to the Guyana and are of Precambrian age.

最古老的岩石层在圭亚那雨林,它们的年龄可以追述到前寒武纪.

Among them the Precambrian and Cenozoic eras are the main metallogenic epoches in the world.

就全球而言,前寒武纪和新生代是金矿的重要成矿期.

Early-Precambrian rocks are widely exposed in Dunhuang-Beishan area, GansuProvince.

甘肃敦煌 - 北山地区广泛出露早前寒武纪岩石.

In the world a lot of gold deposits occur in the early Precambrian greenstone belts.

早前寒武纪花岗岩—绿岩地体中赋存着丰富的金矿床.我国绿岩带主要分布在华北陆台,也是重要的含金岩系.